PDF of 104 KB for semiconductor 2SK1421, classed as a schematic in the index. JIS numbering places 2SK parts in the N-channel FET family; maker and package cannot be determined from the name. A datasheet of this kind is used to find which leg is gate, drain and source, to read absolute maximum ratings, and to select a cross-reference replacement with comparable characteristics. Always match the printed code on the component to the sheet before relying on it.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)